615 results about "Dry mixing" patented technology

The invention discloses ultra-high performance concrete and a preparation method thereof. The ultra-high performance concrete comprises the following components in percentage by mass: 15%-25% of cement, 3%-6% of nano SiO2, 30%-35% of fly ash or steel slag powder, 35%-40% of recycled aggregate, 1%-4% of fiber, 0.5% of a microbial remediation agent and 1%-3% of nano TiO2. The preparation method comprises the following steps: S1, pretreating the recycled aggregate; and S2, packaging the microbial remediation agent: mixing the bacillus pasteurii spores with calcium lactate, and wrapping the mixture in calcium phosphate microspheres. S3, step-by-step stirring; S3.1, dry mixing: uniformly stirring the cement, the fly ash, the nano SiO2, the nano TiO2 and the recycled aggregate; s3.2, wet mixing is carried out, water solution fibers containing the polycarboxylic acid water reducing agent are added, uniform stirring is carried out, and the water-binder ratio of the water solution containing the polycarboxylic acid water reducing agent is 0.18; s3.3, final mixing: adding the packaged microbial remediation agent, and uniformly stirring; and S4, directional curing: performing steam curing at 80 DEG C for 48 hours, performing ultraviolet irradiation, and performing constant-temperature and constant-humidity curing for 7 days. The ultra-high performance concrete has the effects of low cost, low carbon emission, multi-function integration and repeatable crack self-repairing.

The coarse aggregate ultra-high performance concrete premix lifting, transferring and mixing device comprises a control system, an aggregate batching system, an aggregate lifting system, a dry mixing main machine system, a feeding vehicle, a steel fiber feeding system and a stirring system, the whole stirring process is automatically controlled and comprises key steps of automatic metering, automatic raw material feeding, mixing and the like, so that manual operation is remarkably reduced, errors and inconsistency caused by manual metering are avoided, and the accuracy and repeatability of stirring each time are ensured; step-by-step feeding of each part is coordinated through a control system, so that the stirring efficiency and the uniformity of concrete are improved; by establishing a relational expression between a concrete mixture stirring uniformity index and parameters such as the stirring time, the stirring speed, the number of stirring blades, the vibration frequency of the two-stage vibrating screen and the like, key parameters in the stirring process are more accurately controlled, and it is ensured that the stirring uniformity of each batch of concrete reaches a preset standard.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and an electrochemical device, and the preparation method of the lithium iron phosphate positive electrode material comprises the following steps: carrying out dry mixing on a phosphorus source, an iron source, a lithium source and a first carbon source to obtain a primary mixture; performing primary sintering on the primary mixture to obtain a lithium iron phosphate precursor; mixing and grinding the lithium iron phosphate precursor, a second carbon source and a solvent to obtain a secondary mixture; and carrying out secondary sintering on the secondary mixture to obtain the lithium iron phosphate positive electrode material. Through the synergistic effect of dry mixing and grinding, the dry mixing is adopted, the grinding and spray drying times are reduced, the process is optimized, the energy consumption is reduced, meanwhile, the grinding process is adopted, the particle size of the secondary mixture is accurately controlled, and the compaction density and the electrical property of the lithium iron phosphate positive electrode material are synchronously improved.

The invention relates to the technical field of cement materials, in particular to a red-mud-containing steel slag composite cementing material and a preparation method thereof.The method comprises the steps that red mud, slag, steel slag, desulfurized gypsum and sulphoaluminate cement clinker are subjected to dry mixing to obtain an initial mixture; determining whether the excitation capability of the potential hydration activity reaches the standard or not based on the alkaline matching index, and adjusting the weight part of the sulphoaluminate cement clinker; adding a composite exciting agent to obtain activated slurry; determining whether the dispersion effect of the flocculation structure of the initial mixture is qualified or not based on the dispersion index of the flocculation structure, and adjusting the ball milling rotating speed; adding a polymer emulsion to obtain an initial composite cementing material; determining whether the synergistic enhancement effect of the polymer emulsion and the activated slurry is qualified or not based on the synergistic enhancement index, and adjusting the dripping rate of the polymer emulsion; the steel slag composite cementing material containing the red mud is obtained. The preparation stability of the red mud-containing steel slag composite cementing material is improved.

The preparation method comprises the following steps: 1, dispersing an iron source, a phosphorus source, a lithium source, a carbon source, a dispersing agent, an element doping agent and a solvent in proportion, dividing the dispersed slurry into three parts of slurry A, B and C in proportion, respectively grinding the three parts of slurry, and respectively carrying out spray drying; 2, pre-sintering the three parts of spray materials at different temperatures, and crushing the pre-sintered materials; and step 3, mixing the crushed pre-sintered materials so as to realize multi-stage grain composition. Carrying out dry mixing on a carbon source and the pre-crushed material according to a certain mass ratio; and 4, carrying out secondary sintering, crushing and demagnetizing on the mixed material to obtain the multi-stage grading high-compaction lithium iron phosphate positive electrode material. According to the invention, primary sintering material grain grading and secondary carbon coating and sintering strengthening are realized through graded particle size design, and the compaction density and the specific capacity of the lithium iron phosphate positive electrode material are synergistically improved.

The invention discloses a high-dosage RAP recycled asphalt mixture and a preparation method thereof, and the method comprises the following steps: step 1, carrying out homogenization treatment on an epoxy resin system and a rubber-asphalt composite system according to a weight ratio of 1: 5-1: 30 to obtain a composite modified asphalt system; 2, preheating the waste asphalt pavement material to 110-130 DEG C, performing dry mixing, adding a petroleum ether regenerant, heating to 150-170 DEG C, and performing dry mixing again to obtain a mixture 1; step 3, preheating new fine aggregate, coarse aggregate and steel slag in batches, adding into the mixture 1, and carrying out dry mixing to obtain a mixture 2 with a primary grading framework; step 4, adding the composite modified asphalt system prepared in the step 1 into the mixture 2, and performing wet mixing to obtain a mixture 3; and step 5, homogenizing the mixture 3 to finally obtain the target recycled asphalt mixture. The invention aims to realize high-mixing-amount recycling of the waste asphalt pavement material.

The invention discloses a composite conditioner for acid soil of slope cropland and application of the composite conditioner. The conditioner comprises the following components in percentage by mass: 12%-18% of calcium peroxide, 18%-32% of a buffer mineral compound, 1.5%-3.0% of an anti-scouring controlled-release material, 10%-25% of a nutrient carrier and fertilizer, 0.5%-3.0% of a binder and a granulation aid, and the balance of inert filler and water. The preparation process comprises the steps of dry mixing, granulation, drying and coating. The product provided by the invention can realize high residue of CaO and stable pH under the condition of heavy rainfall of slope cropland, effectively inhibit the pH fall of acid soil, reduce aluminum toxicity and reduce nutrient loss. By controlling the content and proportion of the calcium peroxide, the buffer mineral compound and the anti-scouring controlled-release material, the calcium peroxide, the buffer mineral compound and the anti-scouring controlled-release material have a synergistic effect in a slope cropland environment, so that not only is the initial rapid acid inhibition capability ensured, but also the lasting pH stability and high residual rate are realized through buffer and controlled-release technologies.

The invention relates to a composite hydroxypropyl methylcellulose skeleton sustained-release material and a preparation method thereof, and belongs to the technical field of drug sustained release. The sustained-release material is prepared from 70 to 90 parts of hydroxypropyl methylcellulose (HPMC), 10 to 20 parts of sodium alginate, 8 to 15 parts of chitosan, 0.1 to 0.2 part of Omega-3 fatty acid, 0.05 to 0.06 part of vitamin D, 2.5 to 5 parts of soluble calcium salt-zinc salt composite cross-linking agent, 0.5 to 1.5 parts of hydrolyzable cross-linking agent, 3 to 10 parts of enzyme sensitive auxiliary material, 1 to 5 parts of pore-foaming agent and 2 to 8 parts of hydrophobic blocking agent. The preparation method comprises the steps of raw material pretreatment and dry mixing, active component dispersion liquid preparation, wet granulation and primary cross-linking, secondary cross-linking and drying, vacuum drying and size stabilization, curing and packaging and the like. The sustained-release material provided by the invention has the advantages of controllable drug release rate, good mechanical strength and biodegradability, is suitable for sustained-release delivery of Omega-3 fatty acid, vitamin D and other active components, and can improve the bioavailability and stability of drugs.

The invention discloses modified cement-water glass slurry and a preparation method thereof, and belongs to the technical field of building material preparation. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 50-70 parts of Portland cement, 20-35 parts of a water glass solution, silica fume, modified nano-silica, an early strength agent and the like, carrying out dry mixing on solid powder, stirring with part of deionized water to form base slurry, adding the water glass solution and the rest deionized water, and carrying out high-speed dispersion to obtain a slurry; and finally, carrying out ultrasonic treatment for 10-15 minutes at the frequency of 20-40 kHz and the power of 300-500 W. Wherein the early strength agent is compounded by triethanolamine and sodium sulfate according to the ratio of 1: 2-1: 3. According to the method, through raw material compounding and process optimization, the dispersity, the early strength and the crack resistance of the slurry are improved, and the method is mainly used for grouting operation in the field of construction engineering such as foundation reinforcement and water prevention and leakage stoppage.

The invention relates to the technical field of flame-retardant materials, in particular to a halogen-free low-smoke flame-retardant material and a preparation process thereof. The halogen-free low-smoke flame-retardant material is prepared from the following raw materials: an ethylene-vinyl acetate copolymer, linear low-density polyethylene, maleic anhydride grafted modified polyethylene, a composite flame retardant, magnesium hydroxide, a synergistic flame retardant, an interface modifier and the like. The composite flame retardant is prepared from a sulfydryl-containing silane coupling agent, aluminum hydroxide and vinyl acetate. A composite flame retardant is prepared from a mercapto silane coupling agent, aluminum hydroxide and vinyl acetate as raw materials, the composite flame retardant is introduced into a material system, the dispersity and compatibility of inorganic filler in a polymer group are improved, a more continuous cross-linked network structure is formed, high-speed dry mixing, melt mixing and extrusion molding by a double-shaft eccentric rotor extruder are adopted, and the flame-retardant composite material is prepared. The processability of the material and the quality of a final product are improved, and the flame retardant property of the material is improved through the synergistic effect of the synergistic flame retardant.

The invention belongs to the technical field of building materials, and particularly relates to a preparation method of a biomass reinforced cement-based thermal insulation wall material and the wall material. The preparation method comprises the following steps: (1) crushing wood fibers, putting the crushed wood fibers into a NaOH solution, washing with water and drying; (2) carrying out dry mixing on cement, the modified wood fiber, nano SiO2 particles and calcium stearate; (3) diluting hydrogen peroxide with warm water, adding into the mixture, and stirring; (4) injecting the foaming slurry into a mold, and vibrating; and (5) steam curing. Through a collaborative technology of fiber surface modification, nano-particle regulation and control and hydrophobic layer construction, the comprehensive performance breakthrough of the fireproofing grade of A1 grade, the heat conductivity coefficient of 0.048-0.055 W / (m.K) and the compressive strength of 1.2-1.8 MPa is realized. The energy consumption is reduced by 70% through the low-temperature steam curing process, the proportion of agricultural waste is larger than or equal to 30%, the carbon emission intensity is smaller than or equal to 150 kgCO2 / m < 3 >, and the requirement for green buildings is met.

The invention belongs to the technical field of negative carbon building materials, and particularly relates to a multi-element solid waste negative carbon cement-based material and a preparation method thereof. The material is prepared from the following components in parts by weight: 10 to 320 parts of carbonized carbide slag, 0 to 240 parts of uncarbonized carbide slag, 25 to 640 parts of calcined coal gangue, 25 to 800 parts of Portland cement, 6 to 320 parts of silica fume and other pozzolanic mineral admixtures and 30 to 800 parts of mixing water. The preparation method comprises the following steps: carbonizing the carbide slag until the content of calcium carbonate is more than or equal to 90%, and calcining and activating the coal gangue at 700-800 DEG C; all the powder raw materials are subjected to dry mixing, water is added for segmented stirring, and standard curing is performed after pouring forming. The carbonized carbide slag is used for replacing limestone to achieve carbon sequestration, the calcined coal gangue is used for replacing calcined clay, natural resources are prevented from being exploited, the cement clinker replacement rate of 70% is achieved through the synergistic effect of multi-element solid waste in a low clinker system, the material has excellent mechanical and durability, and carbon emission and resource consumption are remarkably reduced.

The invention relates to an agglomerated ceramic abrasive which is prepared from the following raw materials in percentage by weight: 25-30% of a ceramic bond, 65-70% of diamond micro-powder, 1-3% of titanium powder, 2.5-5% of nitrate, 0.3-0.5% of nickel sulfate and 1-3% of aluminum zirconate, and is prepared by the following steps: adding water into the raw materials, uniformly mixing, and grinding; and then carrying out spray granulation, impurity drying and sintering to obtain the agglomerated ceramic abrasive material. Compared with a common ceramic bond diamond agglomerated abrasive material, the agglomerated ceramic abrasive material prepared by the method has the advantages of high hardness, uniform particle distribution, good grinding performance and the like. When the agglomerated ceramic abrasive is used for polishing marble tiles, no obvious scratches appear on the surfaces of the tiles, the surface consistency is good, and the polishing efficiency of the marble tiles is high.

The invention discloses a carbide slag fly ash concrete aerated block and a preparation method thereof, and belongs to the technical field of resource utilization of building materials and solid waste. The aerated block comprises the following raw materials: carbide slag, fly ash, gypsum, Portland cement, aluminum powder paste, a nano core-shell structure calcium-aluminum-silicon polymer and a zwitterionic foam-stabilizing polymer, the raw materials have a specific weight part range. Wherein the nano core-shell structure calcium-aluminum-silicon polymer is prepared by dispersing fly ash in water to form slurry, reacting the slurry with sodium silicate and a sodium metaaluminate solution in sequence, then adding calcium nitrate and a zinc sulfate solution for continuous reaction, and carrying out separation, washing, drying and grinding; the zwitterionic foam-stabilizing polymer is prepared by polymerizing a monomer in a solvent, precipitating and separating out, quaternizing, activating carboxyl crosslinking, dialyzing and purifying, and freeze-drying. All the steps relate to process parameters such as dry mixing time, stirring time, curing temperature, pressure and time, and the performance of the aerated block is improved through component optimization and preparation process improvement.

The invention discloses a recycled aggregate concrete lightweight partition board and a manufacturing method thereof, cement, coarse aggregate, fine aggregate, pearl grains and fibers are subjected to dry mixing together to form a mixture; mixing an adhesive and a first part of water, and adding the mixture into the mixture to form a first mixture; after CaCl2 and NaCl are mixed with a second part of water, a plasticizer and a foaming agent are added, and after foaming is completed, a second mixture is formed; performing dry mixing on the second mixture and the first mixture to obtain a concrete mixture, and curing to obtain the partition board. According to the invention, the biological waste shells are applied to the concrete, and the construction waste aggregate is used for replacing the natural gravel aggregate in the traditional cement-based partition wall board, so that the renewable and environment-friendly concrete partition wall board is prepared, meanwhile, the material ratio and the preparation method are simple, solid wastes are effectively utilized, the consumption of non-renewable resources is reduced, and the cost is reduced. Popularization and application are facilitated.

The invention belongs to the field of fiber reinforced composite materials, and provides an SCA modified basalt fiber cement base and a preparation method thereof.The preparation method comprises the following steps that basalt fibers are pretreated; a gamma-aminopropyltriethoxysilane solution, a gamma-glycidyl ether oxypropyltrimethoxysilane solution and a gamma-methacryloyloxypropyltrimethoxysilane solution are prepared, and the dried basalt fibers are soaked in the solutions respectively to be modified; naturally airing at room temperature after soaking, drying in an air dry oven, cooling to room temperature, and sealing and storing; carrying out dry mixing on the modified basalt fiber, ordinary Portland cement, sand and an additive to prepare an SCA modified basalt fiber cement base; by adopting different SCAs and introducing additional reaction functional groups, the interface bonding strength between the basalt fibers and a cement matrix is improved, and the problem of non-uniform fiber dispersion is solved, so that the comprehensive performance of the material is improved.

The invention relates to a negative electrode slurry mixing method which comprises the following steps: adding a powder material into a feeding hole of a double-screw extruder for dry mixing, and conveying the dry-mixed powder material into the double-screw extruder for pre-kneading; deionized water is added for wetting, the flow of the deionized water is controlled to be increased firstly and then reduced, and wet powder is formed; adding deionized water for kneading, and controlling the flow of the deionized water to be increased and then reduced to form kneaded powder; adding SBR (Styrene Butadiene Rubber) and deionized water, and obtaining semi-finished slurry from a discharge hole of the double-screw extruder; introducing the semi-finished slurry into a homogenizer for dispersion; and pumping the slurry dispersed by the homogenizer into a dispersion kettle for dispersion and defoaming to obtain the negative electrode slurry. For large-particle-size graphite, the flow of deionized water is adjusted step by step, the side feeding solid content is gradually increased, the grinding effect is improved, the properties such as the particle size, fineness and sedimentation of slurry are optimized, and the coating stability and the pole piece peeling strength are improved.

The invention discloses a high-water-content large-dosage titanium gypsum-based flow-state curing material as well as a preparation method and application thereof, and belongs to the technical field of industrial solid waste resource utilization and building materials. According to the material, 50-70 parts of titanium gypsum, 15-30 parts of slag / fly ash and 5-15 parts of alkaline residue / carbide slag are used as main raw materials, and 0.1-1 part of xanthan gum is used as a flow state regulator as an auxiliary material. The material has high fluidity and self-compaction performance, the mechanical strength (7-day compressive strength is larger than or equal to 5 MPa) and the water stability (the water stability coefficient is larger than or equal to 0.7) of titanium gypsum can be remarkably improved, and meanwhile the leaching concentration of solidified heavy metal ions is lower than a standard value. The preparation method comprises the processes of raw material pretreatment, dry mixing, wet mixing and maintenance, is suitable for the fields of roadbed filling, building 3D printing, mine backfilling and the like, and realizes collaborative development of solid waste recycling and low-carbon building materials.

The invention discloses composite delayed coagulation type magnesium phosphate cement and a preparation method thereof, and relates to the technical field of building materials, the composite delayed coagulation type magnesium phosphate cement comprises a dead burned magnesium oxide and mineral admixture mixture, phosphate, a composite retarder and glue-containing water, in the dead burned magnesium oxide and the mineral admixture, the mass ratio of dead burned magnesium oxide to the mineral admixture is 3: 2, and the mass ratio of phosphate to the composite retarder to the glue-containing water is 1: 1. The mass ratio of the dead burned magnesium oxide and mineral admixture mixture to the phosphate is 3: 1, the mass of the composite retarder is 7-24% of the mass of the dead burned magnesium oxide and mineral admixture mixture, and the water-binder ratio in the glue is 0.18-0.20. The preparation method comprises the steps of high-temperature pretreatment of the mineral admixture, metering and dry mixing of all the components and cement mixing. The attapulgite and the kaolin which are treated at high temperature are mixed with dead burned magnesium oxide, so that the heat release rate at the initial stage of a hydration reaction is reduced, the cement setting time is prolonged, meanwhile, micro holes and cracks in a cement matrix can be filled, the compactness of a magnesium phosphate matrix is improved, and finally the strengths at different ages are improved.

The invention relates to anti-crack plant fiber concrete and a preparation method thereof, and belongs to the technical field of building materials. The anti-crack plant fiber concrete is prepared from cement, fine aggregate, coarse aggregate, modified coconut fiber, mineral powder, fly ash, a water reducing agent, an air entraining agent, an expanding agent and water as raw materials. The preparation method comprises the following steps: adding insoluble dry materials into a forced mixer, carrying out dry mixing to obtain a mixture, dissolving the water-soluble admixture with deionized water, carrying out uniform stirring, adding the obtained mixture into the mixture, and carrying out wet mixing to obtain a concrete mixture. According to the preparation method disclosed by the invention, the anti-crack concrete is prepared from the renewable coconut fibers, so that the dependence on synthetic fibers and steel is reduced, the carbon emission is reduced, and the preparation method is low-carbon and environment-friendly; the prepared concrete material is not easy to crack, and has good impact resistance and shear resistance.

The invention belongs to the technical field of battery materials, and provides an LATP solid electrolyte and a preparation method and application thereof.The preparation method comprises the steps that an LATP solid raw material, inorganic weak acid powder and organic alcohol powder are subjected to dry mixing, the organic alcohol powder comprises at least one of polyvinyl alcohol, polyethylene glycol or polypropylene glycol, and a mixed material is obtained; and sintering the mixed material to obtain the LATP solid electrolyte. Organic alcohol powder and inorganic weak acid powder are adopted to neutralize the acid-base properties of a phosphorus source and a lithium source, so that efficient, mild and uniform reaction is effectively ensured; long-time wet ball milling using a dispersion medium is replaced by dry mixing, so that the phenomena of non-uniform dispersion and segregation of various raw materials caused by an organic dispersion medium are avoided, the situation that the granularity difference value of the raw materials is enlarged due to long-time ball milling is avoided, and the consistency of the raw materials is effectively improved.

The invention discloses a high-strength thermal shock resistant brick and a preparation method thereof. The high-strength thermal-shock-resistant brick is mainly composed of fused zirconia corundum with the particle size of 5-3 mm, fused zirconia corundum with the particle size of 3-1 mm, fused zirconia corundum with the particle size of 1-0 mm, fused zirconia mullite with the particle size of 3-1 mm, fused zirconia mullite with the particle size of 1-0 mm, fused zirconia mullite with the particle size smaller than or equal to 0.088 mm and fused chromic oxide with the particle size of 325 meshes. In addition, nano aluminum nitride powder and a binding agent are added. The preparation method comprises the following steps: firstly, carrying out dry mixing on granules, adding a binding agent into the obtained dry mixed material, stirring, carrying out wet grinding on the wet granular mixed material obtained after stirring, adding various powder materials in the wet grinding process, carrying out mixed grinding, and carrying out pressure forming on semi-dry plastic pug obtained after mixed grinding to obtain a green brick; and sequentially drying and firing the obtained brick blank to obtain the high-strength thermal-shock-resistant brick. The high-strength thermal shock resistant brick prepared by the invention not only has relatively high compressive strength, but also has excellent thermal shock resistance and erosion resistance, and can effectively prolong the service life when being applied to a colored intermittent smelting furnace and a discharge port.

The invention relates to a venturi effect preparation method of a terbinafine film-forming composition, which comprises the following steps: 1) dissolving terbinafine or terbinafine hydrochloride in a solvent to obtain a medicine liquid; 2) mixing the medium chain triglyceride and the medicine liquid to obtain mixed liquid; 3) performing dry mixing with a film-forming agent to obtain a dry-mixed polymer; and 4) adding the dry-mixed polymer into the mixed liquid through a Venturi effect, and hydrating the obtained polymer. The preparation method has the advantages that the composition proportion, the preparation method and the mixing equipment are reasonable in design, the dry-mixed polymer is introduced into the liquid by utilizing the Venturi effect, lumps can be effectively crushed, the hydration effect is improved, the preparation method is efficient and economical, and the preparation time can be effectively saved and the energy consumption can be effectively reduced on the premise of ensuring the use effect.

The invention discloses a goaf filling material based on coal slime and a carbon sequestration method. The goaf filling material comprises the following steps: preparing a composite activator and a plurality of pretreated coal slime, steel slag, superfine slag powder and desulfurized gypsum raw materials; the preparation method comprises the following steps: mixing coal slime, steel slag, superfine slag powder, desulfurized gypsum raw materials and a composite activator in proportion, putting into a closed reaction kettle, and carrying out dry mixing and sufficient stirring; adding a proper amount of water into the dry-mixed raw materials according to a solid-to-liquid ratio of 7: 3, and stirring the water and the raw materials through a reaction kettle until the water and the raw materials are fully mixed to form a strong alkali mixture; filling CO2 gas into the reaction kettle, carrying out primary mineralization reaction, and stirring in the reaction kettle to obtain a paste filling material; conveying the paste filling material to a goaf through a pump body, and performing filling operation according to a preset filling process; and after the filled paste filling material is initially set, secondary mineralization reaction is carried out, supercritical CO2 gas is injected into the paste filling material through the pre-buried pipeline, residual alkaline substances in the paste filling material react, and a compact anti-seepage structure is formed.

The invention relates to the technical field of graphite preparation processes, in particular to a preparation process of high-purity isostatic pressing graphite, which comprises the following steps: crushing calcined petroleum coke or pitch coke raw materials, carrying out primary grinding, carrying out dry mixing on the raw material powder obtained by the primary grinding, and then adding qualified modified pitch for wet mixing to prepare a paste material; performing secondary grinding to obtain paste powder, performing isostatic compaction, and performing pressure relief to obtain a green body; then the green body is placed in a roasting furnace to be vacuumized, nitrogen is introduced for heating and roasting, the temperature gradient of each temperature measuring point is obtained in the roasting process, the frequency domain characteristic difference between the different temperature measuring points in the roasting furnace is calculated, the temperature gradient difference is obtained, then the heating rate in the roasting process is controlled and adjusted, and a roasted product is obtained. And graphitizing and purifying the roasted product to prepare the high-purity isostatic pressing graphite. The preparation method can improve the preparation quality of the isostatic pressing graphite.

The invention provides modified lithium iron phosphate positive electrode slurry and a preparation method thereof.The preparation method comprises the steps that a lithium iron phosphate positive electrode material, a binder PVDF and a first conductive agent are subjected to dry mixing, and a first premix is obtained; adding an organic solvent into the first premix, and stirring for the first time to obtain a second premix; and adding a second conductive agent, an adhesive PVP and an organic solvent into the second premix, and carrying out second stirring to obtain the modified lithium iron phosphate positive electrode slurry. In the preparation process of the modified lithium iron phosphate positive electrode slurry, the binder PVP is added, the binder PVP not only can enable the active substance and the electrode current collector to be bonded together, but also after the binder PVP is added, the viscosity change of the slurry within the preset time is small, and the viscosity stability of the modified lithium iron phosphate positive electrode slurry is further improved. In addition, in the preparation process of the modified lithium iron phosphate positive electrode slurry, the preparation steps are simplified, the production time is shortened, and the production efficiency is improved.

The invention discloses an anti-splashing anhydrous stemming and a preparation method thereof, and belongs to the field of refractory materials for ferrous metallurgy. The anti-splashing anhydrous stemming comprises the following raw materials: anhydrous stemming of zirconia sol modified phenolic resin and gradient mullite coating silicon carbide particles, and the balance of high bauxite clinker, brown aluminum oxide, coke powder, asphalt, a dispersing agent and a defoaming agent. Wherein the zirconia sol modified phenolic resin is prepared by the following steps: reacting phenol with formaldehyde to generate a linear prepolymer, adding an alkali solution for modification, adding zirconium n-butoxide, reacting, and carrying out reduced pressure distillation; the gradient mullite coating silicon carbide particles are prepared by using silicon carbide as a matrix, dispersing the silicon carbide in aluminum hydroxide sol, adding tetraethoxysilane, and carrying out hydrothermal heat preservation and high-temperature calcination. The preparation method comprises the steps of dry mixing, wet mixing, compression molding, curing and the like. The stemming is high in high-temperature bonding strength and good in thermal shock resistance, molten iron splashing can be effectively inhibited, and the service life of a tap hole is prolonged.

A method of producing refractory brick includes heating a spent Claus catalyst, reducing a particle size of the catalyst, dry mixing the catalyst with cement to form a dry mixture, adding water to the dry mixture to form a castable mixture, casting the castable mixture in a mold, curing the mold, and drying the mold to form the refractory brick.

The invention provides a preparation method of a chopped carbon fiber reinforced ceramic-based crucible material, and relates to the technical field of chopped carbon fiber reinforced ceramic-based crucible materials.The preparation method comprises the following steps that S1, chopped carbon fibers and ceramic matrix powder are subjected to dry mixing according to a preset proportion, and the chopped carbon fibers are preliminarily and evenly distributed in the ceramic matrix powder; s2, the carbon fibers obtained after dry mixing and ceramic matrix powder are mixed through a wet method, ball milling or homogenizing treatment is carried out in a liquid medium, the carbon fibers and the ceramic matrix powder are fully dispersed, and mixed slurry is obtained.According to the preparation method, oxidation treatment or acid pickling treatment or a metal coating technology is carried out on the surfaces of the short carbon fibers; according to the invention, the carbon fibers are added into the ceramic matrix, so that the interface bonding force between the carbon fibers and the ceramic matrix is obviously improved, the carbon fibers are uniformly dispersed in the ceramic matrix, the agglomeration problem of the carbon fibers is avoided, and the mechanical properties, including compressive strength, bending strength and thermal shock resistance, of the material are enhanced.

The invention provides a sulfide all-solid-state battery positive electrode membrane as well as a preparation method and application thereof, and relates to the technical field of solid-state batteries. Specifically, the method comprises the following steps: carrying out dry-process mixing on positive electrode component raw materials, and then carrying out hot rolling to obtain a positive electrode film; wherein the positive electrode component raw materials comprise a positive electrode active material, sulfide solid electrolyte, a conductive agent and polytetrafluoroethylene. According to the preparation method, the positive electrode film is prepared by taking polytetrafluoroethylene as a unique bonding component through the technological processes of dry mixing and hot rolling, so that the stress change caused by volume expansion of the positive electrode is effectively inhibited, and the positive electrode capacity is exerted under the load of a high electrode active material; and the preparation process is simple and easy to implement and low in cost, and has good generalizability and application prospects.